The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Oct. 13, 2015
Filed:
Nov. 15, 2012
Applicant:
Koninklijke Philips N.v., Eindhoven, NL;
Inventor:
Ulrich Hechtfischer, Aachen, DE;
Assignee:
Koninklijke Philips N.V., Eindhoven, NL;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
H05B 39/00 (2006.01); H05B 41/295 (2006.01); H05B 41/04 (2006.01); H05B 41/38 (2006.01);
U.S. Cl.
CPC ...
H05B 41/388 (2013.01); H05B 41/295 (2013.01); H05B 41/382 (2013.01);
Abstract
A lighting device and a method for operating a discharge lamp are described. In one embodiment, the discharge lamp comprises a sealed discharge vessel and two electrodes to produce an arc. A driver circuit delivers electrical power to the electrodes. In a run-up interval, electrical power is supplied as an alternating current IL. During the run-up interval, the waveform of the alternating current IL is changed at least once to a spot-enforcing waveform in order to change the mode of attachment of the arc to the electrodes to spot mode.